+1
Mark Jones
AT&T
From www-ws-arch-request@w3.org Wed Oct 9 14:24 EDT 2002
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From: Dave Hollander <dmh@contivo.com>
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Date: Wed, 9 Oct 2002 11:18:49 -0700
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Subject: what is discovery - One concrete proposal
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To try to get temporary closure on the discovery,triangle,
and cloud, let me try to state one position.
Recommendation:
1. Leave it in the spec dract as is or ammended with axioms
from below.
2. Add an example where "discovery" is a trivial role because
there are two parties directly exchanging information that
is hardwired into the service.
3. Label the node "Discovery Agencies"
--------------------------------------------------------------
Discovery = exchange of the service description details necessary
to make a conncection.
Discovery Axioms:
1) discovery need not rely upon formal documents.
2) discovery occurs regardless of when the discovered
information is bound into the connection (early or late).
3) discovery is discovery regardless if the provider or
requestor does the advertising.
4) discovery is discovery even if the data discovered was
already known. All that needs to be true is the potential
that the data *may* be different or new.
5) discovery is discovery even if there are only two parties,
requestor and provider.
I believe that "discovery", as defined above, exists as a
role in all of the scenarios that have been presented here.
So that leads to the question: is "discovery", as defined above,
relevent enough to be included in our base architecture?
I believe discovery is relevent and should be in the
base architecture for the following reasons:
1. the distinction between hypertext and web services
web has hypertext links to create a network, web
services currently do not have a mechanism for defining
a newtwork.
2. good for the "ilities" (scalability, reliability, etc)
3. it always happens, just sometimes it is done outside
of the system.
4. Most people expect to see it. If it is not there, our
audience will either be disappointed or will try to find
it. Either way confusion and mixed understanding will result.